Regarding 5th job 'decent' skills

5th Job decent skills can be used without the item, but they have slight differences. If you have the 5th job decent skill, you also get some minor stat bonuses (most of them are just like +4 all stats at max), and of course, you don't have to switch items in to cast them, but they have cooldowns, so if you don't have a buff freezer or a battleroid, then, dying is a pretty big problem.